On Tue, Oct 04, 2005 at 02:42:58PM +0000, Molle Bestefich wrote: > Andy Smith wrote: > > I tried simply doing a > > > > dd if=/dev/sd[abcd] of=/dev/null > > > > To check each disk in a very unsubtle fashion, but it drives the > > load average on the machine way way up (like to 20+) > > Checked that the disks are using DMA transfers (use 'hdparm')? $ sudo hdparm /dev/sda /dev/sda: HDIO_GET_MULTCOUNT failed: Inappropriate ioctl for device IO_support = 0 (default 16-bit) readonly = 0 (off) readahead = 256 (on) geometry = 14946/255/63, sectors = 122942324736, start = 0 $ sudo hdparm -d /dev/sda /dev/sda: Well that doesn't look right. From dmesg: ata1: SATA max UDMA/133 cmd 0x9E0 ctl 0xBE2 bmdma 0xDB00 irq 11 ata2: SATA max UDMA/133 cmd 0x960 ctl 0xB62 bmdma 0xDB08 irq 11 ata1: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:407f ata1: dev 0 ATA, max UDMA/133, 240121728 sectors: ata1: dev 0 configured for UDMA/133 ata2: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:407f ata2: dev 0 ATA, max UDMA/133, 240121728 sectors: ata2: dev 0 configured for UDMA/133 Vendor: ATA Model: Maxtor 6Y120M0 Rev: YAR5 Type: Direct-Access ANSI SCSI revision: 05 SCSI device sda: 240121728 512-byte hdwr sectors (122942 MB) SCSI device sda: drive cache: write back SCSI device sda: 240121728 512-byte hdwr sectors (122942 MB) SCSI device sda: drive cache: write back sda: sda1 sda2 sda3 Attached scsi disk sda at scsi0, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0, type 0 Vendor: ATA Model: Maxtor 6Y120M0 Rev: YAR5 Type: Direct-Access ANSI SCSI revision: 05 SCSI device sdb: 240121728 512-byte hdwr sectors (122942 MB) SCSI device sdb: drive cache: write back SCSI device sdb: 240121728 512-byte hdwr sectors (122942 MB) SCSI device sdb: drive cache: write back sdb: sdb1 sdb2 sdb3 Attached scsi disk sdb at scsi1, channel 0, id 0, lun 0 Attached scsi generic sg1 at scsi1, channel 0, id 0, lun 0, type 0 ata3: SATA max UDMA/133 cmd 0x9F0 ctl 0xBF2 bmdma 0xE100 irq 10 ata4: SATA max UDMA/133 cmd 0x970 ctl 0xB72 bmdma 0xE108 irq 10 ata3: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:407f ata3: dev 0 ATA, max UDMA/133, 240121728 sectors: ata3: dev 0 configured for UDMA/133 ata4: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:407f ata4: dev 0 ATA, max UDMA/133, 240121728 sectors: ata4: dev 0 configured for UDMA/133 Vendor: ATA Model: Maxtor 6Y120M0 Rev: YAR5 Type: Direct-Access ANSI SCSI revision: 05 SCSI device sdc: 240121728 512-byte hdwr sectors (122942 MB) SCSI device sdc: drive cache: write back SCSI device sdc: 240121728 512-byte hdwr sectors (122942 MB) SCSI device sdc: drive cache: write back sdc: sdc1 sdc2 sdc3 Attached scsi disk sdc at scsi2, channel 0, id 0, lun 0 Attached scsi generic sg2 at scsi2, channel 0, id 0, lun 0, type 0 Vendor: ATA Model: Maxtor 6Y120M0 Rev: YAR5 Type: Direct-Access ANSI SCSI revision: 05 SCSI device sdd: 240121728 512-byte hdwr sectors (122942 MB) SCSI device sdd: drive cache: write back SCSI device sdd: 240121728 512-byte hdwr sectors (122942 MB) SCSI device sdd: drive cache: write back sdd: sdd1 sdd2 sdd3 Attached scsi disk sdd at scsi3, channel 0, id 0, lun 0 Attached scsi generic sg3 at scsi3, channel 0, id 0, lun 0, type 0
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